Also, have fun watching minority turnout crash if Sanders is the nominee.
Your boy Joe Manchin comes from a state that's 94% white, just like Vermont. I fail to see how he would make a difference in that field.
If he picks Cory Booker or Kamala Harris as his VP, then he could easily balance the scale.
I think there's a decent chance Sanders could pick Harris as his running mate.
I doubt she'd accept.
Based on what, exactly? Her ideology aligns more with Sanders than Manchin and she's shown herself to be a Sanders ally in her time as a Senator.
And how often do people get offered VP spots and turn it down?